Design
The M27 is based on the Heckler & Koch HK416, which in turn derives from the M4 carbine and Heckler & Koch G36. It features a gas-operated short-stroke piston action with a rotating bolt. The free-floating barrel is surrounded by MIL-STD-1913 Picatinny rails for use with accessories and optics. The simpler gas-piston rifle system reduces the amount of time it takes to resolve malfunctions on the IAR compared with the M249.
Read more about this topic: M27 Infantry Automatic Rifle
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